Twenty air-conditioning systems designed for use by astronauts in Russias Soyuz spacecraft were each operated for 1,000

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Twenty air-conditioning systems designed for use by astronauts in Russia’s Soyuz spacecraft were each operated for 1,000 hours at a Russian test facility. Two of the systems failed during the test—one after 200 hours and the other after 600 hours.

APPROACH c To determine the percentage of failures [FR(%)], the number of failures per unit of time [FR(N)], and the mean time between failures (MTBF), we use Equations (17-2), (17-3), and (17-4), respectively.

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